Re: [Tails-dev] Faking htpdate user agent worth it?

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Autore: intrigeri
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To: The Tails public development discussion list
Nuovi argomenti: Re: [Tails-dev] Faking htpdate user agent worth it?
Oggetto: Re: [Tails-dev] Faking htpdate user agent worth it?
Hi,

anonym wrote (15 Oct 2012 13:14:24 GMT) :
> OTOH it becomes easier to fingerprint Tails users on their side of
> the pipe, which arguably is worse. Three *full* fetches of known web
> sites are *much* more distinguishable than three header fetches of
> known web sites, so Tails' startup traffic flow then becomes
> a distinctive pattern to look for. Think "Bayesian classifiers"
> which was all the rage a year or two ago.


In case it was not clear: what is proposed is a GET of the page only,
not going back to "wget --mirror" and fetch the page and all related
resources.

Web browsing recognition based on known traffic patterns I've read
about was based on page + resources fetches, which provide quite more
room traffic/time data to work on.

How well would this class of attacks do with a HTML page fetch or
three? (Not a rhetorical question :)

> The fact that Tails' current htpdate should be (relatively) safe from
> fingerprinting since it only fetches headers is already documented here:
> contribute/design/Time_syncing/#index5h1.


This page reads "fingerprinting based on the known traffic pattern
when fetching the full page of any of the members of Tails' HTP source
pools is not possible"; I've always understood, in this sentence, "the
full page" as meaning "the page + all external resources it requires".

Cheers!
--
intrigeri
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